Helena Chmura Kraemer

Summary

Affiliation: Stanford University
Country: USA

Publications

  1. ncbi request reprint Reconsidering the odds ratio as a measure of 2x2 association in a population
    Helena Chmura Kraemer
    Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, CA 94305, USA
    Stat Med 23:257-70. 2004
  2. ncbi request reprint How do risk factors work together? Mediators, moderators, and independent, overlapping, and proxy risk factors
    H C Kraemer
    Department of Psychiatry and Behavioral Sciences, 401 Quarry Rd, Stanford University Medical Center, Stanford, CA 94305, USA
    Am J Psychiatry 158:848-56. 2001
  3. ncbi request reprint Kappa coefficients in medical research
    Helena Chmura Kraemer
    Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Stanford, California, U S A
    Stat Med 21:2109-29. 2002
  4. ncbi request reprint Caution regarding the use of pilot studies to guide power calculations for study proposals
    Helena Chmura Kraemer
    Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, Calif 94305, USA
    Arch Gen Psychiatry 63:484-9. 2006
  5. ncbi request reprint Correlation coefficients in medical research: from product moment correlation to the odds ratio
    Helena Chmura Kraemer
    Department of Psychiatry and Behavioral Sciences, Stanford University, 401 Quarry Road, MC5717 Stanford, CA 94305, USA
    Stat Methods Med Res 15:525-45. 2006
  6. ncbi request reprint Toward non-parametric and clinically meaningful moderators and mediators
    Helena Chmura Kraemer
    Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, CA 94305, U S A
    Stat Med 27:1679-92. 2008
  7. ncbi request reprint Size of treatment effects and their importance to clinical research and practice
    Helena Chmura Kraemer
    Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, California 94305, USA
    Biol Psychiatry 59:990-6. 2006
  8. pmc Assessment of factors influencing preservation of dignity at life's end: creation and the cross-cultural validation of the preservation of dignity card-sort tool
    Vyjeyanthi S Periyakoil
    Department of Medicine, Division of General Internal Medicine and the VA Palo Alto Health Care System, Palo Alto, California, USA
    J Palliat Med 13:495-500. 2010
  9. ncbi request reprint Comments on 'Evaluating the added predictive ability of a new marker' by M. Pencina, R. D'Agostino, R. D'Agostino Jr, R. Vasan, Statistics in Medicine (DOI: 10.1002/sim.2929)
    Helena Chmura Kraemer
    Department of Psychiatry and Behavioral Sciences, Stanford University of Medicine, Stanford, CA, USA
    Stat Med 27:196-8. 2008
  10. ncbi request reprint Care management for low-risk patients with heart failure: a randomized, controlled trial
    Robert Frank DeBusk
    Stanford University School of Medicine, Stanford, California 94304 5735, USA
    Ann Intern Med 141:606-13. 2004

Detail Information

Publications30

  1. ncbi request reprint Reconsidering the odds ratio as a measure of 2x2 association in a population
    Helena Chmura Kraemer
    Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, CA 94305, USA
    Stat Med 23:257-70. 2004
    ..In studies assessing reliability or heritability, we recommend the intraclass kappa. In studies in which one binary variable is assessed against a binary criterion, we recommend the weighted kappa...
  2. ncbi request reprint How do risk factors work together? Mediators, moderators, and independent, overlapping, and proxy risk factors
    H C Kraemer
    Department of Psychiatry and Behavioral Sciences, 401 Quarry Rd, Stanford University Medical Center, Stanford, CA 94305, USA
    Am J Psychiatry 158:848-56. 2001
    ..Better methods are needed for understanding the etiology of disorders, such as psychiatric syndromes, that presumably are the result of complex causal chains...
  3. ncbi request reprint Kappa coefficients in medical research
    Helena Chmura Kraemer
    Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Stanford, California, U S A
    Stat Med 21:2109-29. 2002
    ..We illustrate the use of the recommended kappas with applications in medical research...
  4. ncbi request reprint Caution regarding the use of pilot studies to guide power calculations for study proposals
    Helena Chmura Kraemer
    Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, Calif 94305, USA
    Arch Gen Psychiatry 63:484-9. 2006
    ..The argument herein is not meant to discourage clinical researchers from performing pilot studies (or review committees from requiring them) but simply to caution against their use for the objective of guiding power calculations...
  5. ncbi request reprint Correlation coefficients in medical research: from product moment correlation to the odds ratio
    Helena Chmura Kraemer
    Department of Psychiatry and Behavioral Sciences, Stanford University, 401 Quarry Road, MC5717 Stanford, CA 94305, USA
    Stat Methods Med Res 15:525-45. 2006
    ..The present focus is on effect sizes indicating strength of correlation, that is, effect sizes that describe the strength of monotonic association between two random variables X and Y in a population...
  6. ncbi request reprint Toward non-parametric and clinically meaningful moderators and mediators
    Helena Chmura Kraemer
    Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, CA 94305, U S A
    Stat Med 27:1679-92. 2008
    ..Methods based on non-parametric methods specifically designed to facilitate considerations of clinical significance are here introduced for binary moderators and mediators and the discussion opened for what would be needed in general...
  7. ncbi request reprint Size of treatment effects and their importance to clinical research and practice
    Helena Chmura Kraemer
    Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, California 94305, USA
    Biol Psychiatry 59:990-6. 2006
    ..We recommend three equivalent effect sizes: number needed to treat, area under the receiver operating characteristic curve comparing T and C responses, and success rate difference, chosen specifically to convey clinical significance...
  8. pmc Assessment of factors influencing preservation of dignity at life's end: creation and the cross-cultural validation of the preservation of dignity card-sort tool
    Vyjeyanthi S Periyakoil
    Department of Medicine, Division of General Internal Medicine and the VA Palo Alto Health Care System, Palo Alto, California, USA
    J Palliat Med 13:495-500. 2010
    ..Preserving patient dignity is a sentinel premise of palliative care. This study was conducted to gain a better understanding of factors influencing preservation of dignity in the last chapter of life...
  9. ncbi request reprint Comments on 'Evaluating the added predictive ability of a new marker' by M. Pencina, R. D'Agostino, R. D'Agostino Jr, R. Vasan, Statistics in Medicine (DOI: 10.1002/sim.2929)
    Helena Chmura Kraemer
    Department of Psychiatry and Behavioral Sciences, Stanford University of Medicine, Stanford, CA, USA
    Stat Med 27:196-8. 2008
  10. ncbi request reprint Care management for low-risk patients with heart failure: a randomized, controlled trial
    Robert Frank DeBusk
    Stanford University School of Medicine, Stanford, California 94304 5735, USA
    Ann Intern Med 141:606-13. 2004
    ..Nurse care management programs for patients with chronic illness have been shown to be safe and effective...
  11. ncbi request reprint Factors associated with psychiatric hospitalization of individuals diagnosed with dementia and comorbid bipolar disorder
    John O Brooks
    Palo Alto Veterans Affairs Health Care System, Palo Alto, California 94304, USA
    J Geriatr Psychiatry Neurol 19:72-7. 2006
    ..These findings suggest that disorders with increased frequency in BD affect the course of dementia...
  12. ncbi request reprint "Rules" of evidence in assessing the efficacy and effectiveness of treatments
    Helena Chmura Kraemer
    Department of Psychiatry and Behavioral Sciences, Stanford University, CA 94305, USA
    Dev Neuropsychol 24:705-18. 2003
    ....
  13. ncbi request reprint Biomarkers in psychiatry: methodological issues
    Helena Chmura Kraemer
    Department of Psychiatry and Behavioral Sciences, Stanford University, CA 94305, USA
    Am J Geriatr Psychiatry 10:653-9. 2002
    ..Authors discuss methods for establishing the validity of a biomarker. Finally, they convey a word of caution about overinterpreting the clinical or scientific value of any biological measure...
  14. ncbi request reprint Developing the diagnostic and statistical manual V: what will "statistical" mean in DSM-V?
    Helena Chmura Kraemer
    Dept of Psychiatry and Behavioral Sciences, Stanford University, 401 Quarry Road, MS 5717, Stanford, CA 94305, USA
    Soc Psychiatry Psychiatr Epidemiol 42:259-67. 2007
    ....
  15. ncbi request reprint DSM categories and dimensions in clinical and research contexts
    Helena Chmura Kraemer
    Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, CA 94301, USA
    Int J Methods Psychiatr Res 16:S8-S15. 2007
    ..Possible objections to the proposal are discussed, concluding with some general criteria for implementing this proposal...
  16. ncbi request reprint Lifetime prevalence and pseudocomorbidity in psychiatric research
    Helena Chmura Kraemer
    Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Stanford, Calif 94305, USA
    Arch Gen Psychiatry 63:604-8. 2006
    ..This bias is what we refer to as pseudocomorbidity...
  17. ncbi request reprint Are certain multicenter randomized clinical trial structures misleading clinical and policy decisions?
    Helena Chmura Kraemer
    Department of Psychiatry and Behavioral Sciences, Stanford University, 401 Quarry Road, 5717, Stanford, CA 94305, USA
    Contemp Clin Trials 26:518-29. 2005
    ....
  18. ncbi request reprint Measures of clinical significance
    Helena Chmura Kraemer
    Stanford University, Stanford, CA, USA
    J Am Acad Child Adolesc Psychiatry 42:1524-9. 2003
  19. pmc Creation and the empirical validation of the dignity card-sort tool to assess factors influencing erosion of dignity at life's end
    Vyjeyanthi S Periyakoil
    Department of Medicine, Stanford University, Palo Alto, California 94304, USA
    J Palliat Med 12:1125-30. 2009
    ..The DCT is a promising tool that may help clinicians identify key factors resulting in perceptions of erosion of dignity in adult palliative care patients...
  20. ncbi request reprint Categorical versus dimensional approaches to diagnosis: methodological challenges
    Helena Chmura Kraemer
    Department of Psychiatry and Behavioral Sciences, C305, 401 Quarry Road, Stanford University School of Medicine, Stanford University, Stanford, CA 94305 5717, USA
    J Psychiatr Res 38:17-25. 2004
    ..We argue that failure to utilize the correct approach under the appropriate circumstances can result in impaired clinical and research decision-making...
  21. doi request reprint How to assess the clinical impact of treatments on patients, rather than the statistical impact of treatments on measures
    Helena Chmura Kraemer
    Department of Psychiatry and Behavioral Sciences, Stanford University, Palo Alto, CA, USA
    Int J Methods Psychiatr Res 20:63-72. 2011
    ..The strategies discussed here are possible solutions to this dilemma. It is crucial to develop successful strategies to assess the effects of treatments on individual patients...
  22. doi request reprint Events per person-time (incidence rate): a misleading statistic?
    Helena Chmura Kraemer
    Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, CA 943305, USA
    Stat Med 28:1028-39. 2009
    ..More careful design and survival analyses are recommended in place of use of EPTs...
  23. ncbi request reprint Mediators and moderators of treatment effects in randomized clinical trials
    Helena Chmura Kraemer
    Department of Psychiatry and Behavioral Sciences, Stanford University, Calif 94305, USA
    Arch Gen Psychiatry 59:877-83. 2002
    ..We recommend that RCTs routinely include and report such analyses...
  24. doi request reprint Toward sound objective evaluation of clinical measures
    Helena Chmura Kraemer
    Department of Biostatistics in Psychiatry, Stanford University, Stanford, CA, USA
    Am J Geriatr Psychiatry 21:589-95. 2013
    ....
  25. pmc How and why criteria defining moderators and mediators differ between the Baron & Kenny and MacArthur approaches
    Helena Chmura Kraemer
    Department of Psychiatry and Behavioral Sciences, Stanford University, CA, USA
    Health Psychol 27:S101-8. 2008
    ....
  26. doi request reprint Discovering, comparing, and combining moderators of treatment on outcome after randomized clinical trials: a parametric approach
    Helena Chmura Kraemer
    Department of Psychiatry and Behavioral Sciences, Stanford University, 1116 Forest Avenue, Palo Alto, CA 94301 3032, USA
    Stat Med 32:1964-73. 2013
    ....
  27. doi request reprint Determining gene moderation of environmental risk factors for a mental disorder: a "perfect storm" of methodological problems
    Helena Chmura Kraemer
    Stanford University, CA, USA
    Int J Methods Psychiatr Res 21:185-94. 2012
    ....
  28. doi request reprint Clinical trials design lessons from the CATIE study
    Helena Chmura Kraemer
    Department of Psychiatry and Behavioral Sciences, Stanford University, Palo Alto, CA 94301, USA
    Am J Psychiatry 166:1222-8. 2009
    ....
  29. ncbi request reprint A simple effect size indicator for two-group comparisons? A comment on r equivalent
    Helena Chmura Kraemer
    Department of Psychiatry, Stanford University, Stanford, CA 94305, USA
    Psychol Methods 10:413-9. 2005
    ....
  30. ncbi request reprint On disentangling states versus traits: demonstration of a new technique using the Alzheimer's disease assessment scale
    Joy L Taylor
    Department of Veterans Affairs, Sierra Pacific Mental Illness Research, Education, and Clinical Center, Palo Alto, California 94304, USA
    Alzheimer Dis Assoc Disord 16:254-60. 2002
    ..We discuss how state-trait analyses can be helpful in focusing attention on those areas of assessment most likely to accomplish specific objectives...